Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d4f2add7a01403…

MALICIOUS

PDF

77.3 KB Created: 2021-06-04 22:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b054029c82efa7d6c716b4dfb8ec3c9c SHA-1: 5b7074e373474bfdaeae9eed8feb5f940ff2e80e SHA-256: 04d4f2add7a014033b510c16a7b99a572ec906cc6c35f5d37f323a19edf49797
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/pbw?utm_term=guia+para+el+examen+de+comipems+2018+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366028/normal_603fd8e905845.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388272/normal_6000660b4b6c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480728/normal_6034580fc2ca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459917/normal_5fd19e6366c41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415756/normal_5fcfa647459a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496378/normal_5fe0fb8724854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393188/normal_5fd8d35e025ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_60304b9cc7485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_600b9c0f211ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_60696505a1e8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393188/normal_603840fa9fc5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382784/normal_5fc87b0550057.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lodenapokot.pbworks.com/f/geek_vape_aegis_x_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06eba1f-fc60-4da2-9395-81da9c0a01a1/lenovo_g50-80_usb_drivers_for_windows_10_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f53d48-6164-4210-98a8-1226a6dbb03d/damiralabiroditiwinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55de736c-b132-4e0d-8052-1b5c9f0bce7a/kalumudomepaburujivatiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44f599bd-2119-4c9c-b594-f52e20b1f4d4/94437732286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ce54db3-e56c-4fa0-8542-77f0b3e533c5/unleashing_mr._darcy_2016.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/biology_question_bank_for_class_12_state_board.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed597a63-019b-49b0-92db-b6fdf019a53f/72691099130.pdfIn PDF document text
    • http://vananizi.pbworks.com/f/65449981655.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/zexuposovojovad.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/f/95380711781.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 5920 bytes
SHA-256: 9918a2c90fdd41f7b94677134845e69018888797afa2591f2bba4ae0495fc1dc
font_01_sfnt_off0001004a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004A 11512 bytes
SHA-256: e841e2203eb3a5b6af0464630fce505f7330506d67524bbb4e11c9adf9297ad1

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